1.

/**
 * FWP, Ausgewählte Probleme aus dem ACM Programming Contest, SS10 
 * Problem: 10922 2 the 9s
 * Link: http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=21&page=show_problem&problem=1863
 * 
 * @author Anton Pavlushko, IBB7B,  
 * @version 1.0, 10/10/2010
 * 
 * Status : Accepted
 * Runtime: 0.288
 */

import java.io.*;
import java.util.*;
public class Main {
	public static void main(String[] args) throws IOException {
	    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
	    String start, current_line = "";
        int i, number, summa, count, length;
	    
	     try {
	         while ((current_line=in.readLine())!= null && !current_line.equals("0")) { 
	        	 start=current_line;
	        	 summa=0;
	        	 count=0;
	        	 do  {
		        	 summa=0;	 
			         length=current_line.length();
		        	 for(i=0;i<length;i++) {
		        		 summa+=Character.getNumericValue(current_line.charAt(i));
		        	 }
		        	 current_line=String.valueOf(summa);
	        	 } while (summa%9==0 && count++>=0 && summa!=9);
	        	 
	        	 if (count>0)
	        	 System.out.println(start+" is a multiple of 9 and has 9-degree "+count+"."); 
	        	 else
	        	 System.out.println(start+" is not a multiple of 9."); 

	         } // end while 
	       } // end try
	       catch (IOException e) {
	         System.err.println("Error: " + e);
	       }
	}
}


2. 

/**
 * FWP, Ausgewählte Probleme aus dem ACM Programming Contest, SS10
 * Problem: 10922  2the9s
 *
 * @author Robert Reichart
 *
 * Status : Accepted
 * Runtime: 0.364
 */

import java.io.*;

class Main{
    public static void main(String... args){
        try{
            BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
            String line=in.readLine();
            while(!line.equals("0")){
                String linecopy=line;
                int degree=0;
                if (line.length()==1){degree=1;}
                while(line.length()>1){
                    int x=0;
                    for (int i=0;i<line.length();i++){
                        x=x+Integer.parseInt(Character.toString(line.charAt(i)));
                    }
                    line=Integer.toString(x);
                    degree++;
                }

                if(line.equals("9")){
                    System.out.println(linecopy + " is a multiple of 9 and has 9-degree " + degree + ".");
                }else{
                    System.out.println(linecopy + " is not a multiple of 9.");
                }
                line=in.readLine();
            }
        }catch(Exception ex){}

    }
}